Shaquille O'Neal is the current oldest active player in the NBA as of 2010 he's 38.
With Shaquille O'Neal's retirement, Kurt Thomas is the current oldest player.
A player CAN NOT be called for an offside infringement if not "active in the play" however you can be "active in the play" without playing the ball. A player CAN be in an offside POSITION with out being "active in the play."
One who once played, but is no longer an active player on an organized team.
There are numerous active baseball players that are considered to be great. A few are Miguel Cabrera, Mike Trout, and Clayton Kershaw.
On the current 2012 Yankees active roster, Eduardo Nunez is the youngest player.
The best player without steriods I think is Albert Pujols.